Senior QA Engineer in C# (Test Automation & Data Testing)

We are looking for a Senior QA Engineer with a strong background in both manual and automated testing to ensure the quality and reliability of complex data-driven applications. The role combines approximately 70% manual testing and 30% test automation, with a particular focus on validating large datasets, data flows, and data mappings. You will contribute to test strategy, develop and maintain automated tests using C# and BDD frameworks, and collaborate closely with developers and business stakeholders to ensure comprehensive test coverage.

Working Hours: Availability is required from 09:00 to 16:00 UK time on working days. Responsibilities Perform manual and automated testing of application functionality, data processing, and integrations Evaluate test scenarios and determine which cases are best suited for automation versus manual execution Develop and maintain automated tests in C#, including test fixtures and step definitions Use BDD frameworks such as SpecFlow, Cucumber, FitNesse, or equivalent tools Create and maintain clear, structured, and reusable Gherkin scenarios Design and execute data-focused tests, validating large datasets, data flows, transformations, and mappings between systems Write and maintain SQL queries to verify data accuracy, consistency, completeness, and integrity Integrate automated tests into CI/CD pipelines and maintain test execution reports Define test scenarios, select appropriate testing techniques, and ensure adequate coverage of requirements and business risks Identify, document, track, and communicate defects, collaborating with development and business teams to resolve issues Participate in Agile ceremonies and contribute to continuous improvements in testing processes and quality practices Requirements 3+ years of proven experience in software quality assurance, covering both manual testing and test automation Strong programming skills in C# and experience developing automated tests Practical experience with BDD testing frameworks such as SpecFlow, Cucumber, FitNesse, or similar tools Experience creating and maintaining test fixtures, step definitions, and Gherkin scenarios Strong SQL skills and experience validating large volumes of data Solid understanding of data flows, data transformations, and data mapping validation Ability to assess testing needs and make informed decisions about when to automate and when to perform manual testing Experience integrating automated tests into CI/CD pipelines and working with test reporting tools Knowledge of test design techniques, risk-based testing, and test coverage Experience working in Agile development environments Strong analytical and problem-solving skills, attention to detail, and effective communication skills English proficiency at an Upper-Intermediate level (B2) or higher Ability to maintain the required working-hour availability from 09:00 to 16:00 UK time on working days Nice to have Experience in financial services or trading environments, such as commodity trading, investment banking, brokerage, or exchange platforms Familiarity with trading systems, financial data, or business-critical data processing Georgia (Production) We connect like-minded people Delivering innovative solutions to industry leaders, making a global impact Enjoyable working environment, whether it is the vibrant office or the comfort of your own home Opportunity to work abroad for up to two months per year Relocation opportunities within our offices in 55+ countries Corporate and social events We invest in your growth Leadership development, career advising, soft skills and well-being programs Certifications, including GCP, Azure and AWS Unlimited access to EPAM's internal learning database Free English classes with certified teachers We cover it all Participation in the Employee Stock Purchase Plan Monetary bonuses for engaging in the referral program Comprehensive medical & family care package Five trust days per year (sick leave without a medical certificate) Benefits package (sports activities, a variety of stores and services) Armenia (Prod) We connect like-minded people Delivering innovative solutions to industry leaders, making a global impact Enjoyable working environment, whether it is the vibrant office or the comfort of your home Opportunity to work abroad for up to two months per year Relocation opportunities within our offices in 55+ countries Corporate and social events We invest in your growth Leadership development, career advising, soft skills and well-being programs Certifications, including GCP, Azure and AWS Unlimited access to EPAM's internal learning database Free English classes with certified teachers We cover it all Participation in the Employee Stock Purchase Plan Monetary bonuses for engaging in the referral program Comprehensive medical & family care package Four trust days per year for personal needs Discounts for fitness clubs Benefits package (hotels, restaurants, stores and services) Kazakhstan (Prod) We connect like-minded people: Delivering innovative solutions to industry leaders, making a global impact Enjoyable working environment, whether it is the vibrant office or the comfort of your own home Opportunity to work abroad for up to two months per year Relocation opportunities within our offices in 55+ countries Corporate and social events We invest in your growth: Leadership development, career advising, soft skills and well-being programs Certifications, including GCP, Azure and AWS Unlimited access to EPAM's internal learning database Free English classes with certified teachers Discounts in local language schools, including online courses for the Kazakh language We cover it all: Participation in the Employee Stock Purchase Plan Monetary bonuses for engaging in the referral program Medical & family care package Six trust days per year (sick leave without a medical certificate) Coverage of psychology sessions of your choice Benefits package (sports activities, a variety of stores and services) Housing support program: preferential mortgage access via Otbasy Bank partnership Kyrgyzstan (Prod) We connect like-minded people: Delivering innovative solutions to industry leaders, making a global impact Enjoyable working environment, whether it is the vibrant office or the comfort of your own home Opportunity to work abroad for up to two months per year Relocation opportunities within our offices in 55+ countries Corporate and social events We invest in your growth: Leadership development, career advising, soft skills and well-being programs Certifications, including GCP, Azure and AWS Unlimited access to EPAM's internal learning database Free English classes with certified teachers We cover it all: Monetary bonuses for engaging in the referral program Medical & family care package Six trust days per year (sick leave without a medical certificate) Coverage of psychology sessions of your choice Discounts for fitness clubs and sports programs Benefits package (sports activities, a variety of stores and services) Uzbekistan (Prod) We connect like-minded people: Delivering innovative solutions to industry leaders, making a global impact Enjoyable working environment, whether it is the vibrant office or the comfort of your own home Opportunity to work abroad for up to two months per year Relocation opportunities within our offices in 55+ countries Corporate and social events We invest in your growth: Leadership development, career advising, soft skills and well-being programs Certifications, including GCP, Azure and AWS Unlimited access to EPAM's internal learning database Free English classes with certified teachers Discounts in local language schools, including offline courses for the Uzbek language We cover it all: Monetary bonuses for engaging in the referral program Medical & family care package Four trust days per year (sick leave without a medical certificate) Discounts for fitness clubs, dance schools and sports programs Benefits package (sports activities, a variety of stores and services)